I am attempting the mission Airdrop with the raven, which is the only pet I have with flight. When commanded to fetch the raven just says something about the item being too heavy or not being able to carry that. While I think this is awesome that the pets have a strength level I don't seem to have a way to complete the level. Any help appreciated

// Get all swords and protect the village.function onSpawn(event) { while (true) { var item = hero.findNearestItem(); // The pet should fetch the item if it exists: if (item) pet.fetch(item.pos.x, item.pos.y); }}//Assign onSpawn function for the pet's "spawn".pet.on("spawn", onSpawn);while (true) { // Guard the left passage: var enemy = hero.findNearestEnemy(); if (enemy) hero.attack(enemy);}// here is what I am using. btw The Raven is saying, " I can't carry that!" Not sure where I got the heavy stuff.